aluminum vs steel flywheel for stroker

You know what i forgot about something for anyone here claiming the lighter is slower, have you ever raced a lambo, ferrari, maybe a porsche gt3....
Their flywheels and clutches are very light....super light

Amazing though i never see lambo's, porches, ferrari's and mclarens stalling all over the place, and they are so slow off the line.....right. . . . lets here the excuses